¹H NMR (700 MHz, CDCl₃) δ 8.72 (s, 3H), 8.24 (dd, J = 1.0, 4.9 Hz, 5H), 8.20 (d, J = 8.3 Hz, 4H), 7.69 (m, J = 4.4 Hz, 5H), 7.03 (ddd, J = 0.2, 5.2, 6.7 Hz, 5H), 4.14 (s, 1H), 2.72 (s, 2H), 2.38 (t, J = 11.4 Hz, 4H), 1.84 (d, J = 11.4 Hz, 7H), 1.72 (dq, J = 4.1, 12.3 Hz, 10H), 1.44 (s, 40H).